package com.lagou.web.servlet;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.serializer.SimplePropertyPreFilter;
import com.lagou.base.BaseServlet;
import com.lagou.pojo.Course;
import com.lagou.pojo.Course_Lesson;
import com.lagou.pojo.Course_Section;
import com.lagou.service.CourseContentService;
import com.lagou.service.CourseService;
import com.lagou.service.impl.CourseContentServiceImpl;
import com.lagou.service.impl.CourseServiceImpl;
import org.apache.commons.beanutils.BeanUtils;

import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.util.List;
import java.util.Map;

@WebServlet("/courseContent")
public class CourseContentServlet extends BaseServlet {
    //展示课程内容
    public void findSectionAndLessonByCourseId(HttpServletRequest request, HttpServletResponse response) {
        try {
            //1.获取参数
            String course_id = request.getParameter("course_id");
            //2.业务处理
            CourseContentService contentService = new CourseContentServiceImpl();
            List<Course_Section> list = contentService.findSectionAndLessonByCourseId(Integer.parseInt(course_id));

            //3.返回结果
            String result = JSON.toJSONString(list);
            response.getWriter().println(result);
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    // 回显章节对应的课程信息
    public void findCourseById(HttpServletRequest request, HttpServletResponse response) {
        try {
            //1.获取参数
            String course_id = request.getParameter("course_id");
            //2.业务处理
            CourseContentService contentService = new CourseContentServiceImpl();
            Course course = contentService.findCourseById(Integer.parseInt(course_id));
            //3.返回JSON数据
            SimplePropertyPreFilter filter = new SimplePropertyPreFilter(Course.class, "id", "course_name");

            String result = JSON.toJSONString(course, filter);

            response.getWriter().println(result);
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    /**
     * 保存修改章节信息
     *
     * @param request
     * @param response
     */
    public void saveOrUpdateSection(HttpServletRequest request, HttpServletResponse response) {
        try {
            //1.获取参数  从域对象中获取
            Map<String, Object> map = (Map) request.getAttribute("map");
            //2.创建Course_Section
            Course_Section section = new Course_Section();
            //3.使用BeanUtils工具类,将map中的数据封装到section
            BeanUtils.populate(section, map);
            //4.业务处理
            String result = null;//返回结果
            CourseContentService contentService = new CourseContentServiceImpl();
            if (section.getId() == 0) {//判断是否携带id
                //新增操作
                result = contentService.saveSection(section);

            } else {
                //修改操作
                result = contentService.updateSection(section);
            }
            //5.相应结果
            response.getWriter().println(result);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    //修改章节状态
    public void updateSectionStatus(HttpServletRequest request, HttpServletResponse response) {
        try {
            //获取参数
            int id = Integer.parseInt(request.getParameter("id"));
            int status = Integer.parseInt(request.getParameter("status"));
            //业务处理
            CourseContentService contentService = new CourseContentServiceImpl();
            String result = contentService.updateSectionStatus(id, status);
            response.getWriter().println(result);
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
    //保存课时信息

    public void saveOrUpdateLesson(HttpServletRequest request, HttpServletResponse response) {
        try {
            //1.获取参数
            Map<String, Object> map = (Map) request.getAttribute("map");
            //2.创建Course_Lesson对象
            Course_Lesson lesson = new Course_Lesson();
            //3.使用BenUtils工具类将map中的数据封装到lesson
            BeanUtils.populate(lesson, map);
            //4.业务处理
            CourseContentService contentService = new CourseContentServiceImpl();
            //判断是否携带id
            if (lesson.getId() == 0) {
                //新增课时
                String result = contentService.saveLesson(lesson);
                //响应结果
                response.getWriter().println(result);
            } else {
                //修改课时
                String result = contentService.updateLesson(lesson);
                response.getWriter().println(result);
            }

        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

}
